SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366ca422707fe986f6b5d48640948d46d5ba1c890be96df4f6c3c3dc6892dc55' 
  AND token = 'nFNAYXVBJmkvvbH63Kbot5shZP+CmwwB9f6TmVxtUCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}